Filter



Dc. 8, 1942. l.. w. WILLIAMS FILTER 2 Sheets-Sheet 1 Filed Dec. 26, 194C;

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AZ/W d@ ATTORNEYS Dec. 8, 1942. L. w. WILLIAMS FILTER Filed Deo.

2 Sheets-Sheet 2 sNvENToR OWQVZMMQ BY di ATTORNEYS Patented Dec. 1942 vUNITED STATES, PATENT vOFFICE:

FILTER Lewis W. Williams, Short Hills, N. J., assigner to PurOlator Products, Inc., Newark, N. J., a corporation of Delaware Application December 26, 1940, Serial No. 371,620 a 4 Claims. (01.210-181) This invention relates to lters and vmore especially to lters particularly adapted for purifying the lubricant of an internal combustion engine.

An object'of this invention is a lter of this Fig. 2 is a section on the line 2-t of Fig. i;

Fig- 3 is an enlarged section on the line 3 3.

of Fig. a. Fig. 4 is a section substantially on the line d-li of Fig. 3;

Fig. 5 is a longitudinal section. through a modiiied xembodiment oi the invention;

Fig. 6 is a side elevation partly broiren away of Fig. 5 and Fig. 7 is an elevation of one end or" the lter.

Referring first to Figs. l to inclusive, a gemerally cylindrical container iii Ais provided at its ends with reenforcing disirs li and i2 and each disls is provided with a tapped opening, the opening in the disl it constituting the inlet to the container and the opening in the disk; i2 constituting the outlet therefrom. The disl'; i2 carries a support i3 in the shape oi; the frustum of a cone having a cylindrical portion it of .less diameter than the main portion of said support. y

The ler unit 'lo' consists of a plurality of filtering elements or leaves it, each or which is composed of two thin sheets i l of paper or other porous brous material treated with a thermoplastic and hardened in accordance with the procedure described in .the patent to Wells, No. As shown in Fig. 2, the two sheets are of generally square conguration with rounded corners which are of substantially the same diameter as the diameter of the container it. The sheets il are cemented together along their peripheral edges with a suitable thermo-plastic and each sheet is provided with a centralopening. Between the two sheets is arranged adrainage member i@ (Fig. 3), the exterior coniiguration of which conforms to that of the sheets- 'lhe drainage member preferably is composed of fibrous material such for example as paper impregnated with aI thermo-plastic. The interior portion'of the drainage member l@ is open except for two radial arms I9 terminatingin semicircular portions 20, the interior diameter of which is the same as thev interior diameter of the apertures in the disks and the opposing ends of said portion being slightly spaced. The narrow exterior rim portion of the drainage member I8 is interposed between the edges of thedisks H and both of the disks are cementedv thereto.

The leaves I6 are mounted on a tube 2l of slightly less cross-section than the aperture in the sheets passing through said aperturesand spacing members 22 are provided at opposite sides of each leaf,'each spacing member being cemented to the outer face of a sheet il. A metal washer 23 is provided at each end or the tube 2l in contact with the outermost spacing member 22 and each end of the tube 2i is flanged outwardly at 2li to hold the washers 23 in place and complete the assembly of the, lter unit. One or more apertures 2t is provided in the tube 2l to permit oil flow thereinto. The right end of the tube 2i ts over the portion lli of the support i3 and is held in such position by means later to be described.

A cap 2lhas a ange r2e which engages the Washer 25 at the left end of the tube 2i (Fig. l). A helical spring 2t is supported at one end by the reenforcing member il and its other end surrounds and supports the cap 2l. The spring 2t exerts pressure on' the capiti to force it' against the lgasket 25 thereby holding the ltering unit i5 in position and also forming an oiltight seal between the cap and the washer it?.

An orificel 33 is provided in the portion it to establish communication between the interior of the tube 2l and the outlet port in the reenn` forcing member it. `Also, an orice 3i of much smaller diameter than the orifice is provided in the wall of the support i3 to provide communication between the interior of the container ill and the outlet port. Small projections .the lter being inoperative due to congealed oil therein. This feature is fully described in. the vU. S. patent to Redner, No. 1,969,033 with respect to the aperture 25 in the lter disclosed in said patentcorrugations ofthe remaining leaf at an angle in the neighborhood of 90 (Fig. 2). This arrangement of` corrugations strengthens the disks and facilitates drainage of oil from the interior of the leaf'. y

In the operation of the lter just described, oil to be ltered is introduced into the container I through the inlet port in the reeniorcing member II and ilowsaround the filtering unit to iill the container. The ltering unit is in contact with the container only along the edges of the curved corners of the unit so that passageways are provided for the ow of oil from one end of the container to the other and between the leaves. The oil passes through the sheets il into the interior of the leaves and from the interior of the leaves it escapes through the opening between the ends of the semi-circular portions 2li of the drainage member I8 into the space around the tube 2i. The nltered oil then ows into the interior of the tube 2l through the apertures 26 and from the interior of the tube the filtered oil ilows through the orice 3i) to the outlet in the reenforcing member I2. A small amount of unnltered oil is by-passed around the filtering element through the orice 3i for the purpose described in said Redner patent.

In the event that any shrinkage develops in the spacing members t2, the` semi-circular porassociera of such tube. A cap 8l has/a ange 88 engaging the gasket 65. A helical spring 69 is attached at-one end to the end member 6I and its other end surrounds and supports the cap 61. This spring serves the same function as the sprin 29 previously described.

The container 5E! is arranged with the projection 4H received in the tube 6I and is held in such position by means now to be described. A telescoping member 'lil is supportedat one end by the cover member di and its other end is seated in a depression formed in the end member 5i. A helical spring 'II tends to expand the telescoping member l@ to maintain its inner end in contact with the end member 5I and v urge the container 66 to the right. When it is moved and the container 5I tions 2t of the drainage member or in the disks Il, such shrinkage'fis compensated for .by in ward movement of the lefthand washer 23 under the inuence of the spring 29. Thus, any

' possibility of leakage of unfiltered oil into the tube 2i is prevented.

in Figs. 5 to 7 inclusive is illustrated a modified form of lter unit arranged in the oil pan of an internal combustion engine. In this modification, d designates the cil pan in one vertical wall of which is provided an opening normally @10s-ed by a co'ver ai heid in piace by bolts 42. .A tting is is permanently attached to the opposite vertical wall of the oil pan d@ and is provided with a projection te extending toward the desired to replace .the filter, the cover 4I is-rethrough the side Wall opening by means of the handle 62 and a new nlter inserted in the same position as formerly occupied by the removed d@ into the outlet passages d5 and tl and to the interior of the oil pan. An orifice 'i3 is provided in the end member 5 I, to provide for a slight by-pass of oil as previously described, this orince being of much smaller diameter than the outlet interior of the oil pan. In the projection M is A provided a passageway t5 terminating at one end in an orifice 4S and having a downwardly extending portion 41. A second passageway 48 is provided in the fitting 43 and terminates at one end in a threaded socket 49. A cylindrical container 50 is provided with closures 5| and 52 and in the end member 52 is provided an annular reenforcirig member 53v having apertures alined with apertures in the end member 52 to provide inlet ports 54 for the container.`

The filtering unit 55 consists of filtering leaves 56 composed of sheets 51 and in each leaf is provided a drainage member 58, such drainage member having inwardly projecting arms 55 terminating in semi-circular portions 6|) so that the unit 55 is similar in all respects to the filtering unit I5 previously described. The leaves 56 are supported by a tube 6I and spacers 62 4are arranged on both sides of each leaf. At the left end of the tube 6I is provided a washer 63 and at the right end of the tube 6I is provided a collar 63a, each of which engages the outermost spacing member 62 at its end of the tube and each of which is held in place by a. flange 64 turnedoutwardly at each end of the tube. The collar 63a is xed to the end 52 of the container 50.

One or more apertures 65 are provided in the tube 6I for directing flow of oil into the interior lt is of course understood that various modications may be made in the structure above described without in any way departing from the spirit of the invention as defined in the appended claims.

I claim:

1. A filtering unit comprising a plurality of two-wall fluid-permeable lter leaves with each wall having a central aperture, a perforated tube passing through said apertures, separators on said tube between adjacent leaves, a spacer interposed between and sealed to the adjacent walls of each leaf at the outer edges thereof, a pair of arms extending inwardly from said spacer in radial arrangement with respect to said aper-4 tures, each arm terminating in a substantially semi-circular portion concentric with said apertures and having the opposing ends 'of said portions slightly spaced to form drainage outlets, and means for maintaining said leaves in assembled relation on said tube.

2. A filtering element comprising a pair of fluid penetrable sheets having aligned apertures, a spacer interposed between and sealed to said sheets at the outer edges thereof, and a pair of arms extending inwardly from said spacer in radial arrangement with respect to said apertures and each arm terminating in a substantially semi-circular portion concentric with said apertures and having the opposing ends of said portions slightly spaced to form drainage outets.

3. A filter comprising a container having an inlet and an outlet, an abutment in said container having a projection equipped with a passageway communicating with said outlet, a peris withdrawn forated tube supported at one end by said abutment with ythe tube.siidably,receiving said projection and communicating with said passager way, a. pair of relatively movable washers carwashena plurality of two-wall huid-permeable illter leaves mounted on said tube between `said washers. each leaf having a passageway through which said tube passes and having an outlet' communicating with said passageway, separators on said tube between adjacent filter leaves 'and 'I ried by said tube at opposite ends thereof, a 5

ilange at each end olf said tube engageable by a resilient means supported by said container independently of said tube and urging one washer toward they other and both washers toward said abutment. v

4. A filter comprising a container having an inlet and an outlet, an abutment in said containei'V having an opening communicatinswith l said outlet, a perforated tube supported at one end bysaid 'abutmentvw'ith the tube interior communicating with said outlet, a pair of relatively movable washers carried by: .said tube-at opposite ends thereon-a lplurality of. two-wall huid-permeable illter leaves mounted on said` tube between said washers, each wall having an aperture-through which said .tube passes. a f

spacer interposed. between and sealed to said walls at the outer edge thereof, a pair of arms `extending inwardly'from said spacer in radial arrangement with respect toy said apertures, each arm terminating ina substantially semi-circular 

